A new set of certified reference materials of the chemical composition of the iron ores
Journal Title: Journal of Metallic Materials - Year 2019, Vol 71, Issue 1
Abstract
The study assumed the production of ten certified reference materials of the chemical composition of raw ores, magnetite and hematite concentrates and pellets. The raw materials were obtained from Ukraine, Russia, Liberia, Brazil, Canada, and Norway. Their chemical composition was confirmed by the WD XRF method, and the mineral composition was analyzed with the use of X-ray diffraction. Radioactivity studies were also carried out. Dried, ground and mixed materials were subjected to homogeneity tests, which were carried out on samples melted in a mixture of lithium borates, using a ZSX Primus 2 X-ray spectrometer. Based on the results of the homogeneity test and the use of analysis of variance (ANOVA) for the results of individual determinations, the contribution of homogeneity in the uncertainty of the certified value was calculated. International certification round-robin program of tests with fourteen laboratories was organized and carried out. The results of the analyses were developed statistically in accordance with ISO Guide 35:2017. Certificates, data sheets and labels were developed. The production was carried out in accordance with the requirements of PN-EN ISO 17034.
Authors and Affiliations
Grażyna Stankiewicz, Marta Kubiczek, Waldemar Spiewok
Keywords
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- EP ID EP663660
- DOI 10.32730/imz.2657-747.19.1.3
- Views 226
- Downloads 0
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